Tsubasa Shibahime possesses a petite stature, hip-length wavy brown hair, and green eyes, leading to frequent misjudgments of her age. Her mother's death during childbirth resulted in her being raised solely by her indulgent father, Toshiharu Shibahime, fostering deep-seated feelings of loneliness and an intense need for attention and affection. She nurtured a longstanding romantic attachment to Soichiro Arima since middle school, though her repeated attempts to confess met only his obliviousness. She settled into a sibling-like relationship with him, contingent on him avoiding other romantic interests. Determined to attend high school with Arima, she studied diligently but was delayed by a skateboarding accident, preventing her from starting at Hokuei High School with her peers. Learning of Arima's relationship with Yukino Miyazawa ignited intense jealousy and resentment in Tsubasa. She initially targeted Yukino with petty aggression and physical confrontations, fueled by feelings of betrayal and insecurity. A pivotal clash resulted in Tsubasa openly declaring her feelings for Arima, which he inadvertently overheard, creating temporary awkwardness. Following this confrontation, Tsubasa and Yukino gradually forged a genuine friendship. Yukino, charmed by Tsubasa's cuteness, often treated her like a doll, cementing Tsubasa's status as the "baby" of their social circle. Family dynamics further shaped her. Tsubasa fiercely opposed her father's decision to remarry his nurse, Izumi Ikeda, fearing abandonment after losing Arima. She ran away to Yukino's home, accusing Izumi of ulterior motives. Her perspective shifted upon meeting her future stepbrother, Kazuma Ikeda. Bonding over their shared experiences as only children of single parents—including the pain of returning to empty homes—Tsubasa accepted the marriage. Her relationship with Kazuma evolved beyond familial ties; he later developed romantic feelings for her. Within the manga continuity, they eventually married, resolving her earlier aversion to men stemming from perceived betrayals by Arima and her father. Tsubasa's personality exhibits duality: she displays childlike affection and charm around Arima and Yukino after reconciliation, but initially exhibited spoiled, volatile behavior when threatened or jealous. Her growth is reflected in transitioning from possessive resentment to accepting expanded familial and romantic relationships, particularly through her bond with Kazuma. Her name carries symbolic weight: "Tsubasa" means "wing," while "Shibahime" combines "brushwood" and "princess."